How do I access workspace areas in 2.80 with Python
Figured it out thanks to iceythe from blenderartists:
https://blenderartists.org/t/access-to-workspace-areas/1137024

for area in bpy.data.workspaces['my_workspace'].screens[0].areas:
    if area.type == 'VIEW_3D':
      for spaces in area.spaces:
          if spaces.type == 'VIEW_3D':
              area.spaces.active.clip_start = 0.1